Hoisting mechanism



June 10, 1930. M. P. HOLMES 1,753,631

HOISTING MECHANISM v l v 7 Original Filed Dec. 15. 1920 2 Sheets-Sheet 1 June 10, 1930. M. P. HOLMVES 1,763,631

HOISTING MECHANISM 1 Original Filed Dec. 13. 1920 2 Sheets-Sheet 2 Patented June 10, 1939 UNIT aa r ()FFICE- MORRIS 1. HOLMES, or onanniuo v'r, NEW HAMPSHIRE, ASSIGNOR To sULLIvAii MACHINERY COMPANY, A CORPORATION or MASSACHUSETTS HOISTING Mno rrANIsiir Application filed December 13, 1920, Serial N'430,211. Renewed May 14, 1930.

y invention relates to hoisting mechanisms.

An object of my invention is to provide an improved hoisting mechanism. Another object of my invention is to provide an improved hoisting mechanism of the type. in which the motor is enclosed within the hoist drum. A further object of my invention is to provide an improved hoisting mechanism of the type in which the driving motor is enclosed within the drum and in which the drum itself shall constitute a portion of the motor. Other objects of my invention will appear in the course of the following specifi- 1 cation and appended claims.

In the accompanying drawings I have shown for purposes of illustration one form which my invention may'assume in practice.

In these drawings,-

Fig. 1 is a plan view, with the parts broken away, showing the illustrative embodiment of my improved hoisting mechanism.

, Fig. 2 is a longitudinal central section on theline 2-2 of Fig. 1. V

Figs. 3 and4 are transverse sections through the hoisting drum and taken respectively on the lines 33 and 44 of Fig. 2.

' Fig. 5 is a View partially in section on the line 55 of Fig. 2- and partially in elevation,

3 showingdetails of the driving mechanism and the drum. 1 v

Fig. 6 is a developed section on the line 66 of Fig. 5 showing the driving gear of my improved hoisting mechanism.

In its" illustrative form, my improved hoist is disclosed as comprising a rotating drum 1 j ournaled in a U-shaped support 2. The drum comprises a central portion 3 and end portions generally indicated by 4and 5, thelatter be ing provided with stub shafts 6 and'7 journaled in suitable bearings 8 and 9 in the arms of the support 2. i a

My improved hoisting mechanism is of the fluid pressure driven type and enclosed within the central section 3 of the, drum is an improved driving motor comprising a portion of my invention. This driving motor is of the same type as is disclosed in my oo-pending application, Serial No. 255,797, filed Sep- 50 tember 26, 1918, and comprises a pair of rotors 10 and 11 each of which is made up of'a central spur gear section 12 and end sections 13 and 14, the end sections 13 and 14 being provided with helical teeth forming intermeshing tooth blades and cooperating with the central spur gears and with the tooth blades on the other rotor to form pockets expanding in volume as the rotors rotate. The rotors are provided with Shafts 15 and 15' journaled respectively in suitable bearings 16, 17, and 18, 19, which are disposed in end 'plate members 20 and 21 secured to the central drum member 3. The drum itself constitutes the rotor housing and is provided with bores of cylindrical shape 22 and 23,

these bores intersecting adjacent the center of the drum. On opposite sides of the rotor housings there are provided inlet and exhaust chambers 24 and 25, the exhaust chamber 25 communicating with generally annular exhaust cavities 26 and 27 formed between the ends of each of the rotors 10 and 11 and the end plates 20 and 21, while the inlet chamber 24 communicates by means ofa passage 28 with the rotor chambers at a point adjacent the mesh line of the teeth of the rotors and in the transverse plane of the spur gears.

Fluid pressure is supplied to the inlet chamber from a passage 30 formed in thestub shaft 7 by means of a generally radially extending passage 29, and fluid is supplied to the passage 30 by means of a stationary sleeve member 31 projecting into an enlarged bore 32 communicating with the opening 30, there being a suitable packing 33 provided around the sleeve member 31 to prevent leakage. The member 31 is formed as a part of a hollow connector member 34 which is secured by bolts 34 tonne of the upright arms of the support-member 2, the member 34 being 1101-.

ill

parallel to the axis of the drum, and this flange has formed upon its inner periphery an internal gear 40. T he member 38 is ournaled in the support for the stub shaft 6 and is freely rotatable, unless held stationary by suitable means hereinafter described. The shaft 15 ofone of the rotors is provided at the end adjacent the member 38 with a spur gear 41 which meshes with a larger spur gear 42 formed on a short shaft 43, journaled at its opposite ends respectively in the end member 4 and in the end plate 20, and the shaft 43 is provided near its opposite end with a small spur gear The spur gear 44 meshes with a larger spur gear 45 secured to a shaft 46 extending tl'irough and journaied in the end plate 4, the opposite end of the shaft 46 being provided with a smaller spur gear 47 which in turn meshes with a driving gear 48, jouraaled on a suitable bearing 49 surrounding a stud 50 formed on the outer side of the end plate 4. The gear 48 meshes with the internal gear 40.

From the foregoing description of the lriving gearing of my hoisting mechanism, it will be understood that as the pinion 41 is rotated by the action ofthe fluid pressure admitted to the rotors, it will serve to drive the train of gears 42, 44, 45, 47, and 48, and if the member 38 is free to rotate, will cause rotation thereofby reason of the fact that the load upon the drum will tend to prevent the latters rotation. If, however, the member 38 is held against rotation in any manner, the driving gear 48 will travel around the stationary internal gear 40 and will cause rotation of the drum as a whole.

For the purpose of holding the end member stationary or releasing it, as may be desired, I provide a stationary brake band 51 comprising a friction lining 52 and a flexible brake applying member 53, the latter having secured to it at opposite ends pivot supporting members 54, 55 to which are connected the members 56'and 57 of a toggle mechanism, actuated by a handle 58, for applying and releasing the brake. Adjacent the bottom of the drum a positioning member 59 is secured to the band 53, and by engagement with flanges 60 011 the support member 2, serves to prevent rotation of the brake band with the member 38. Similar mechanism is provided to cooperate with a suitable annular flange 61 formed integral with the opposite end of the drum member 3, this mechanism comprising a brake band 62 lined with suitable friction material 63 and actuated by a similar toggle 64 by means of a suitable handie 65, and operative to retard rotation of the drum proper upon application of the brake.

From the foregoing description the mode of operation of my improved construction will be readily apparent. Upon admission of air to the rotors 10 and 11, they will be caused to rotate and so drive the spur gear 41. When it is desired to hoist a load, the handle 58 will be moved to apply the brake to the member 38, and upon this being made stationary, rotation of the drum will occur in the manner previously described. When it is desired to lower the load, this may be done either by entirely cutting off the air, and gradually releasing the toggle 64 by means of handle 65, and then controlling the lowering of the load under friction, or, by suitable manipulation of the handle 58, the member 38 may be allowed to rotate sufficiently to permit the load to be lowered. It will also be obvious that if desired the load may be held at any point by so adjusting the tension of the brake band 51 as to permit slipping of the member 38 at precisely the same speed as that at which the driving gear 48 is traveling about its interior periphery. It will therefore be seen that the entire control of the load is possible, while the motor continues to operate at full speed, by a single manually controlled means, i. e., the handle 58.

Another possible method of control is to lock the member 38 and then control the supply of air to the rotors by the throttle in the air line. It has been found that by varying the air supply the load may be raised, lowered, or held stationary as desired. It will also be noted that the motor acts as a compressor during the lowering of the load with the member 58 locked, and so that very little air will need to be supplied to check the rate of lowering, and that, in fact, the motor would probably automatically serve as an over speed preventing means even without the supply of air.

While I have in this application specifically described one form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a hoisting mechanism, a drum, and driving means therefor including a motor comprising a casing formed integral with said drum, and a plurality of intermeshing rotors disposed in said casing and driving said drum, there being power transmission gearing between the drum and one of said rotors.

2. A hoisting mechanism having a drum and a driving motor therefor comprising a motor casing integral with the drum, and a pair of intermeshing rotors disposed in said motor casing, the axes of rotation of said rotors sweeping through surfaces of revolution during the winding operation of said drum.

3. In a hoist, a drum, and a rotating motor therefor comprising bores formed. in said drum, the axes of said bores being spaced from the axis of said drum, rotors in said bores, means for admitting fluid to said rotors adjacent the centers thereof, and means for exhausting said fluid at the ends of said rotors. a

4. A hoisting mechanism having a drum and a driving motor therefor arranged therein and comprising a pair of intermeshing rotors whose axes of rotation sweep through surfaces of revolution during winding operation of said drum, and means for efiecting rotation of said drum by said motor comprising a member driven by said motor and rotatable about an axis fixed with respect to said drum and parallel to but oifset from the axis of the latter, and a member with which said first mentioned member cooperates, said last mentioned member being stationary during drum driving and serving as a trackway around which said first mentioned member rolls during rotation of the drum.

5. A hoisting mechanism having a drum and a driving motor therefor disposed therein and comprising a pair of intermeshing rotors whose axes of rotation sweep through surfaces of revolution during winding operation of said drum, means for effecting rotation of said drum by said motor comprising a member driven by said motor rotatable about an axis fixed with respect to said drum and parallel to but ofiset from the axis of the latter, and a member with which said first mentioned member cooperates, said last mentioned member being stationary during drum drivingv and serving as Y a trackway around which said first mentioned member rolls during rotation of the drum, said drum and sec-' ond mentioned member being provided with stantialiy preventing direct communication between said'motor and chamber.

9. A hoisting mechanism comprising rotatable drum means, a motor therefor having an operative supporting relation to said drum means and also having a plurality of intermeshing rotors adapted to rotate about the axis of said drum means and simultaneously therewith, means forming a closed chamber within said drum means, and reduction gearing between said motor and drum means and having at least a portion disposed within said closed chamber, said reduction gearing including a gear offset from the drum axis and carried by and disposed outside of said chamber forming means.

10. In a hoisting mechanism, a rotatable drum, a driving motor disposed therein, reduction gearing between said motor and drum including an internal gear, and longitudina-lly spaced transverse members rigidly fixed to said drum to form a closed chamber, a part of said reduction gearing being disposed in said closed chamber, said internal gear being disposed outside of said closed chamber and alined with said drum and cooperating with one of said transverse members to form a second closed chamber.

In testimony whereof I aflix my signature.

'. MORRIS P. HOLMES.

braking means whereby each may be held v stationary or released.

6. In ahoist, a drum and a driving motor therefor comprlsmg intermeshmg gears rotating about axes parallel to the axis ofsaid I drum and meshing at the axis of said drum,

said gears being disposed in a housing formed in said drum.

7 In a hoist, a drum and a rotating motor therefor comprising bores formed in said drum, rotors in said bores, means for admitting fluid to said rotors adjacent the centers thereof, and means for exhausting said fluid at the ends of said rotors.

8. A hoisting mechanism comprising rotatable drum means, a motor therefor having a housing rotatable with said drum means, 7 means rigidly connected to said drum means forming a closed chamber within said drum means, and reduction gearing between said motor and said drum means and having at least a portion disposed within said closed chamber, said chamber forming means sub- 

